sort-of OT: interference to remote-control systems from fluo

[Michael A. Terrell]

Phil Hobbs wrote:

On 09/27/2013 03:59 PM, Michael A. Terrell wrote:

Phil Hobbs wrote:

It pretty well does, except in the closely-spaced emission lines, which
respond fast, especially near the ends of the tubes. You can get
annoying amounts of crap out past 1.5 MHz, even with carefully chosen
interference filters.


Phil, a fluorescent lamp puts out noise well past 4 GHz. I used to
use one on the bench to test C-band LNAs and LNBs. Noise sources use gas
discharge tubes to produce broadband noise.


That's the blackbody noise of the plasma, though, which is a lot lower
than the radiated harmonics of the switching frequency. (Besides, at
300K the blackbody peak is at around 18 THz.)

11 GHz is the highest I've worked with. I was just pointing out to the
group that they emit a broad spectrum of crap.


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